Remove the HasOwnBackingButPaintsIntoAncestor compositing state.

Source/core/rendering/compositing/RenderLayerCompositor.cpp

 /*
  * Copyright (C) 2009, 2010 Apple Inc. All rights reserved.
  *
  * Redistribution and use in source and binary forms, with or without
  * modification, are permitted provided that the following conditions
  * are met:
  * 1. Redistributions of source code must retain the above copyright
  *    notice, this list of conditions and the following disclaimer.
  * 2. Redistributions in binary form must reproduce the above copyright
  *    notice, this list of conditions and the following disclaimer in the
@@ skipping 441 matching lines @@
             compositedLayerMappingChanged = true;
         }
 
         break;
     case RemoveFromSquashingLayer:
     case NoCompositingStateChange:
         // Do nothing.
         break;
     }
 
-    if (layer->hasCompositedLayerMapping() && layer->compositedLayerMapping()->updateRequiresOwnBackingStoreForIntrinsicReasons()) {
-        compositedLayerMappingChanged = true;
-        layer->compositedLayerMapping()->setNeedsGraphicsLayerUpdate(GraphicsLayerUpdateSubtree);
-    }
-
     if (compositedLayerMappingChanged && layer->renderer()->isRenderPart()) {
         RenderLayerCompositor* innerCompositor = frameContentsCompositor(toRenderPart(layer->renderer()));
         if (innerCompositor && innerCompositor->staleInCompositingMode())
             innerCompositor->updateRootLayerAttachment();
     }
 
     if (compositedLayerMappingChanged)
         layer->clipper().clearClipRectsIncludingDescendants(PaintingClipRects);
 
     // If a fixed position layer gained/lost a compositedLayerMapping or the reason not compositing it changed,
@@ skipping 716 matching lines @@
     } else if (graphicsLayer == m_scrollLayer.get()) {
         name = "LocalFrame Scrolling Layer";
     } else {
         ASSERT_NOT_REACHED();
     }
 
     return name;
 }
 
 } // namespace blink